Crystals
Equations
Phases
Conductors
Random
100

What are some examples of network covalent bonds?

Diamond, Graphite, etc.

100

You dissolve 3.0 mol of glucose in 2.0 kg of water.

What is the molality?


m = mol solute / kg solvent

m = 3.0 / 2.0

m = 1.5 m

100

What is the process of solid turning into gas?

Sublimation

100
What's the difference between semiconductors and insulators?

Semiconductors: conduct electricity

Insultators: blocks flow of electrical current (no doping)

100

How are intermolecular forces and vapor pressure related?

Inverse

200

What are metallic solids?

A type of network covalent solid

200

A substance has ∆Htrans = 10.0 kJ / mol and ∆Strans = 20.0 J / mol

What is the transition temperature?

Ttrans = ∆Htrans / ∆Strans

10 kJ => 10,000 J

T= 10,000 / 20 

T = 500 K

200

What is viscosity?

resistance of a liquid to a flow

200

What are superconductors?

Conductors with zero resistance
200

What is deposition?

Gas => solid

300

What are molecular solids?

Covalently bonded with long range order (type of crystalline solids)

300

How much heat is required to heat 2.0 mol of a substance with a molar heat capacity of 10 J/(mol·K) from 20°C to 30°C?

q = nCm∆T

n = 2.0 mol

∆T = 30 - 20 = 10 degrees C

q = (2.0) (10) (10)

q = 200 J

300

What type of slope does the liquid phase diagram have?

Negative

300

What is critical temperature?

Highest temperature at which a substance can still exist as a liquid 

300

What is the opposite of vaporization?

Condensation

400

Copper crystallizes in a face-centered cubic (FCC) lattice structure. Calculate the net number of atoms that belong strictly to one FCC unit cell.

4 atoms per unit cell  

1. (8*1/8) = 1 + (6*1/2) = 3 

2. 1 + 3 = 4

400

Calculate ΔG:

ΔH=20 kJ 

T=300 K

ΔS = 0.050 kJ / K

ΔG = ΔH - TΔS

= 20 - (300)(0.050)

ΔG = 5 kJ

400

Describe the difference between melting point and boiling point

Melting point - solid => gas

Boiling point - liquid => gas

400

What is the relationship between conductivity and temperature?

Porportional
400

What is the difference between molarity and molality?

M = mol / L 

m = mol / kg

500

Polonium crystallizes in a Simple Cubic (primitive) lattice structure. Calculate the net number of atoms belonging strictly to one simple cubic unit cell.

1 atom per unit cell
500

A solution has Kf = 2.0 degrees C / m

and m = 0.50 m

What is the freezing point charge?

ΔTfus = -Kfmi

ΔT = -(2.0)(0.50)(1)

= -1.0 degrees C

500

What is the difference between enthalpy and entropy?

Enthalpy (total heat)

Entropy (randomness)

500

What are the two types of doping?

P- type : positive holes (spaces without electrons) added to semiconductor


N- type: negative electrons added to semiconductor

500
Supersaturated vs saturated solution

Supersaturated: more solute than can be dissolved

Saturated: max of amount of solute dissolved

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